Columns with numeric names are not escaped using ['<name>'] syntax

[cirvine-MSFT]

Some of the tables we work with have numeric column names (e.g. "1" or "0"). We found that delta-kusto does not escape these names appropriately and the commands that are produced or syntatically invalid.

For example, delta-kusto will produce this command

.create-merge table TableWithNumberColumns (0:string, 1:string, ['foo']:string) with (folder="", docstring="") 

When it should be

.create-merge table TableWithNumberColumns (['0']:string, ['1']:string, ['foo']:string) with (folder="", docstring="") 

Full steps to reproduce the issue:

Starting with a database called logs, create a table using this command

.create table TableWithNumberColumns (['0']:string, ['1']:string, foo:string)

Create a parameter file for delta-kusto that will pull the state of the database

failIfDataLoss: true
jobs:
  GetSnapshot:
    target:
      adx:
        clusterUri: to-override
        database: logs
    action:
      pushToConsole: false
      filePath:  logs-delta.kql
tokenProvider:
  azCli: 
    interactive: true

delta-kusto produces a delta file that looks like

//  Create tables

.create-merge table TableWithNumberColumns (0:string, 1:string, ['foo']:string) with (folder="", docstring="") 

Expected that the columns 0, and 1 would be escaped

//  Create tables

.create-merge table TableWithNumberColumns (['0']:string, ['1']:string, ['foo']:string) with (folder="", docstring="") 

[cirvine-MSFT]

I'm planning on working on a fix for this, please feel free to assign to me.